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(11) | EP 2 015 227 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | User interface for three-dimensional navigation |
(57) The present invention uses invisible junctions which are a set of local features
unique to every page of the electronic document to match the captured image to a part
of an electronic document. The present invention includes: an image capture device,
a feature extraction and recognition system and database. When an electronic document
is printed, the feature extraction and recognition system captures an image of the
document page. The features in the captured image are then extracted, indexed and
stored in the database. Given a query image, usually a small patch of some document
page captured by a low resolution image capture device, the features in the query
image are extracted and compared against those stored in the database to identify
the query image. The present invention also includes methods for recognizing and tracking
the viewing region and look at point corresponding to the input query image. This
information is combined with a rendering of the original input document to generate
a new graphical user interface to the user. This user interface can be displayed on
a conventional browser or even on the display of an image capture device.
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